A rectangular block is 5 cm × 5 cm × 10 cm in size. The block floating in water with 5 cm side vertical. If it floats with 10 cm side vertical, what change will occur in the level of water?

In both the situation, as the mass of floating block remains same, hence, according to principle of flotation mass or volume of water displaced also remains same. Hence water level will remain same iin both the cases.